F. Zhang, Y. Lei and M. Terrones
Pennsylvania State University,
Keywords: transition metal dichalcogenide, electrodeposition, tribology, energy conversion
Summary:Atomically thin 2 dimensional (2D) materials, such as graphene and boron nitride (BN) have shown clear potential as anti-erosion, and anti-corrosion coatings due to their thermal stability, and chemical inertness. Additionally, the weak interatomic interactions, or van der Waals forces between layers allow low-strength shearing which make 2D materials natural lubricants and protective coatings for anti-abrasion and anti-wear applications. However, in order to utilize these 2D materials in industrial applications, scalable and low cost synthetic routes are required. Thus, developing a robust, economical, and scalable synthetic approach will significantly smooth the transition from scientific research to industrial applications. In industrial processes, electroplating has been widely used, examples include nickel plating to reduce friction, precious metal plating for jewelry, and the creation of protective barriers. These demonstrate that such a route is an economical and viable approach to deposit 2D materials. Herein, we present an electrodeposition approach to synthesize conformal MoS2 coatings on conducting substrates. After 400 °C annealing, polycrystalline MoS2 with structure disorder and strain form. The tribology test indicate that ultra-thin MoS2 film can lower the friction coefficient to 0.15 when the loading force is 5 N. Moreover, the electronic properties of MoS2 can be tuned by doping hetero transition metals into the MoS2 lattice. Since the electrodeposited MoS2 is amorphous phase, the energy needed to break the crystalline bond for the doping is less than that of crystalline MoS2. Herein, we doped V into the electrodeposited MoS2 via solid state approach. As semi-metal, V doped MoS2 can be used as anode for lithium ion battery and catalyst for HER.